1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card ([email protected]) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _LINUX_EXT2_FS_H 17 #define _LINUX_EXT2_FS_H 18 19 #include <linux/types.h> 20 #include <linux/magic.h> 21 #include <linux/fs.h> 22 23 /* 24 * The second extended filesystem constants/structures 25 */ 26 27 /* 28 * Define EXT2FS_DEBUG to produce debug messages 29 */ 30 #undef EXT2FS_DEBUG 31 32 /* 33 * Define EXT2_RESERVATION to reserve data blocks for expanding files 34 */ 35 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 37 #define EXT2_MAX_RESERVE_BLOCKS 1027 38 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 39 /* 40 * The second extended file system version 41 */ 42 #define EXT2FS_DATE "95/08/09" 43 #define EXT2FS_VERSION "0.5b" 44 45 /* 46 * Debug code 47 */ 48 #ifdef EXT2FS_DEBUG 49 # define ext2_debug(f, a...) { \ 50 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 51 __FILE__, __LINE__, __func__); \ 52 printk (f, ## a); \ 53 } 54 #else 55 # define ext2_debug(f, a...) /**/ 56 #endif 57 58 /* 59 * Special inode numbers 60 */ 61 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 62 #define EXT2_ROOT_INO 2 /* Root inode */ 63 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 64 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 65 66 /* First non-reserved inode for old ext2 filesystems */ 67 #define EXT2_GOOD_OLD_FIRST_INO 11 68 69 #ifdef __KERNEL__ 70 #include <linux/ext2_fs_sb.h> 71 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 72 { 73 return sb->s_fs_info; 74 } 75 #else 76 /* Assume that user mode programs are passing in an ext2fs superblock, not 77 * a kernel struct super_block. This will allow us to call the feature-test 78 * macros from user land. */ 79 #define EXT2_SB(sb) (sb) 80 #endif 81 82 /* 83 * Maximal count of links to a file 84 */ 85 #define EXT2_LINK_MAX 32000 86 87 /* 88 * Macro-instructions used to manage several block sizes 89 */ 90 #define EXT2_MIN_BLOCK_SIZE 1024 91 #define EXT2_MAX_BLOCK_SIZE 4096 92 #define EXT2_MIN_BLOCK_LOG_SIZE 10 93 #ifdef __KERNEL__ 94 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 95 #else 96 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 97 #endif 98 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 99 #ifdef __KERNEL__ 100 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 101 #else 102 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 103 #endif 104 #ifdef __KERNEL__ 105 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 106 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 107 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 108 #else 109 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 110 EXT2_GOOD_OLD_INODE_SIZE : \ 111 (s)->s_inode_size) 112 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 113 EXT2_GOOD_OLD_FIRST_INO : \ 114 (s)->s_first_ino) 115 #endif 116 117 /* 118 * Macro-instructions used to manage fragments 119 */ 120 #define EXT2_MIN_FRAG_SIZE 1024 121 #define EXT2_MAX_FRAG_SIZE 4096 122 #define EXT2_MIN_FRAG_LOG_SIZE 10 123 #ifdef __KERNEL__ 124 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 125 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 126 #else 127 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 128 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 129 #endif 130 131 /* 132 * Structure of a blocks group descriptor 133 */ 134 struct ext2_group_desc 135 { 136 __le32 bg_block_bitmap; /* Blocks bitmap block */ 137 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 138 __le32 bg_inode_table; /* Inodes table block */ 139 __le16 bg_free_blocks_count; /* Free blocks count */ 140 __le16 bg_free_inodes_count; /* Free inodes count */ 141 __le16 bg_used_dirs_count; /* Directories count */ 142 __le16 bg_pad; 143 __le32 bg_reserved[3]; 144 }; 145 146 /* 147 * Macro-instructions used to manage group descriptors 148 */ 149 #ifdef __KERNEL__ 150 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 151 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 152 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 153 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 154 #else 155 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 156 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 157 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 158 #endif 159 160 /* 161 * Constants relative to the data blocks 162 */ 163 #define EXT2_NDIR_BLOCKS 12 164 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 165 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 166 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 167 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 168 169 /* 170 * Inode flags (GETFLAGS/SETFLAGS) 171 */ 172 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 173 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 174 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 175 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 176 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 177 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 178 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 179 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 180 /* Reserved for compression usage... */ 181 #define EXT2_DIRTY_FL FS_DIRTY_FL 182 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 183 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 184 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 185 /* End compression flags --- maybe not all used */ 186 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 187 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 188 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 189 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 190 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 191 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 192 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 193 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 194 195 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 196 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 197 198 /* Flags that should be inherited by new inodes from their parent. */ 199 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 200 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 201 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 202 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 203 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 204 205 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 206 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 207 208 /* Flags that are appropriate for non-directories/regular files. */ 209 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 210 211 /* Mask out flags that are inappropriate for the given type of inode. */ 212 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 213 { 214 if (S_ISDIR(mode)) 215 return flags; 216 else if (S_ISREG(mode)) 217 return flags & EXT2_REG_FLMASK; 218 else 219 return flags & EXT2_OTHER_FLMASK; 220 } 221 222 /* 223 * ioctl commands 224 */ 225 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 226 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 227 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 228 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 229 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 230 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 231 232 /* 233 * ioctl commands in 32 bit emulation 234 */ 235 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 236 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 237 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 238 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 239 240 /* 241 * Structure of an inode on the disk 242 */ 243 struct ext2_inode { 244 __le16 i_mode; /* File mode */ 245 __le16 i_uid; /* Low 16 bits of Owner Uid */ 246 __le32 i_size; /* Size in bytes */ 247 __le32 i_atime; /* Access time */ 248 __le32 i_ctime; /* Creation time */ 249 __le32 i_mtime; /* Modification time */ 250 __le32 i_dtime; /* Deletion Time */ 251 __le16 i_gid; /* Low 16 bits of Group Id */ 252 __le16 i_links_count; /* Links count */ 253 __le32 i_blocks; /* Blocks count */ 254 __le32 i_flags; /* File flags */ 255 union { 256 struct { 257 __le32 l_i_reserved1; 258 } linux1; 259 struct { 260 __le32 h_i_translator; 261 } hurd1; 262 struct { 263 __le32 m_i_reserved1; 264 } masix1; 265 } osd1; /* OS dependent 1 */ 266 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 267 __le32 i_generation; /* File version (for NFS) */ 268 __le32 i_file_acl; /* File ACL */ 269 __le32 i_dir_acl; /* Directory ACL */ 270 __le32 i_faddr; /* Fragment address */ 271 union { 272 struct { 273 __u8 l_i_frag; /* Fragment number */ 274 __u8 l_i_fsize; /* Fragment size */ 275 __u16 i_pad1; 276 __le16 l_i_uid_high; /* these 2 fields */ 277 __le16 l_i_gid_high; /* were reserved2[0] */ 278 __u32 l_i_reserved2; 279 } linux2; 280 struct { 281 __u8 h_i_frag; /* Fragment number */ 282 __u8 h_i_fsize; /* Fragment size */ 283 __le16 h_i_mode_high; 284 __le16 h_i_uid_high; 285 __le16 h_i_gid_high; 286 __le32 h_i_author; 287 } hurd2; 288 struct { 289 __u8 m_i_frag; /* Fragment number */ 290 __u8 m_i_fsize; /* Fragment size */ 291 __u16 m_pad1; 292 __u32 m_i_reserved2[2]; 293 } masix2; 294 } osd2; /* OS dependent 2 */ 295 }; 296 297 #define i_size_high i_dir_acl 298 299 #if defined(__KERNEL__) || defined(__linux__) 300 #define i_reserved1 osd1.linux1.l_i_reserved1 301 #define i_frag osd2.linux2.l_i_frag 302 #define i_fsize osd2.linux2.l_i_fsize 303 #define i_uid_low i_uid 304 #define i_gid_low i_gid 305 #define i_uid_high osd2.linux2.l_i_uid_high 306 #define i_gid_high osd2.linux2.l_i_gid_high 307 #define i_reserved2 osd2.linux2.l_i_reserved2 308 #endif 309 310 #ifdef __hurd__ 311 #define i_translator osd1.hurd1.h_i_translator 312 #define i_frag osd2.hurd2.h_i_frag 313 #define i_fsize osd2.hurd2.h_i_fsize 314 #define i_uid_high osd2.hurd2.h_i_uid_high 315 #define i_gid_high osd2.hurd2.h_i_gid_high 316 #define i_author osd2.hurd2.h_i_author 317 #endif 318 319 #ifdef __masix__ 320 #define i_reserved1 osd1.masix1.m_i_reserved1 321 #define i_frag osd2.masix2.m_i_frag 322 #define i_fsize osd2.masix2.m_i_fsize 323 #define i_reserved2 osd2.masix2.m_i_reserved2 324 #endif 325 326 /* 327 * File system states 328 */ 329 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 330 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 331 332 /* 333 * Mount flags 334 */ 335 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 336 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 337 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 338 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 339 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 340 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 341 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 342 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 343 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 344 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 345 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 346 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 347 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 348 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 349 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 350 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 351 352 353 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 354 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 355 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 356 EXT2_MOUNT_##opt) 357 /* 358 * Maximal mount counts between two filesystem checks 359 */ 360 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 361 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 362 363 /* 364 * Behaviour when detecting errors 365 */ 366 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 367 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 368 #define EXT2_ERRORS_PANIC 3 /* Panic */ 369 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 370 371 /* 372 * Structure of the super block 373 */ 374 struct ext2_super_block { 375 __le32 s_inodes_count; /* Inodes count */ 376 __le32 s_blocks_count; /* Blocks count */ 377 __le32 s_r_blocks_count; /* Reserved blocks count */ 378 __le32 s_free_blocks_count; /* Free blocks count */ 379 __le32 s_free_inodes_count; /* Free inodes count */ 380 __le32 s_first_data_block; /* First Data Block */ 381 __le32 s_log_block_size; /* Block size */ 382 __le32 s_log_frag_size; /* Fragment size */ 383 __le32 s_blocks_per_group; /* # Blocks per group */ 384 __le32 s_frags_per_group; /* # Fragments per group */ 385 __le32 s_inodes_per_group; /* # Inodes per group */ 386 __le32 s_mtime; /* Mount time */ 387 __le32 s_wtime; /* Write time */ 388 __le16 s_mnt_count; /* Mount count */ 389 __le16 s_max_mnt_count; /* Maximal mount count */ 390 __le16 s_magic; /* Magic signature */ 391 __le16 s_state; /* File system state */ 392 __le16 s_errors; /* Behaviour when detecting errors */ 393 __le16 s_minor_rev_level; /* minor revision level */ 394 __le32 s_lastcheck; /* time of last check */ 395 __le32 s_checkinterval; /* max. time between checks */ 396 __le32 s_creator_os; /* OS */ 397 __le32 s_rev_level; /* Revision level */ 398 __le16 s_def_resuid; /* Default uid for reserved blocks */ 399 __le16 s_def_resgid; /* Default gid for reserved blocks */ 400 /* 401 * These fields are for EXT2_DYNAMIC_REV superblocks only. 402 * 403 * Note: the difference between the compatible feature set and 404 * the incompatible feature set is that if there is a bit set 405 * in the incompatible feature set that the kernel doesn't 406 * know about, it should refuse to mount the filesystem. 407 * 408 * e2fsck's requirements are more strict; if it doesn't know 409 * about a feature in either the compatible or incompatible 410 * feature set, it must abort and not try to meddle with 411 * things it doesn't understand... 412 */ 413 __le32 s_first_ino; /* First non-reserved inode */ 414 __le16 s_inode_size; /* size of inode structure */ 415 __le16 s_block_group_nr; /* block group # of this superblock */ 416 __le32 s_feature_compat; /* compatible feature set */ 417 __le32 s_feature_incompat; /* incompatible feature set */ 418 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 419 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 420 char s_volume_name[16]; /* volume name */ 421 char s_last_mounted[64]; /* directory where last mounted */ 422 __le32 s_algorithm_usage_bitmap; /* For compression */ 423 /* 424 * Performance hints. Directory preallocation should only 425 * happen if the EXT2_COMPAT_PREALLOC flag is on. 426 */ 427 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 428 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 429 __u16 s_padding1; 430 /* 431 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 432 */ 433 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 434 __u32 s_journal_inum; /* inode number of journal file */ 435 __u32 s_journal_dev; /* device number of journal file */ 436 __u32 s_last_orphan; /* start of list of inodes to delete */ 437 __u32 s_hash_seed[4]; /* HTREE hash seed */ 438 __u8 s_def_hash_version; /* Default hash version to use */ 439 __u8 s_reserved_char_pad; 440 __u16 s_reserved_word_pad; 441 __le32 s_default_mount_opts; 442 __le32 s_first_meta_bg; /* First metablock block group */ 443 __u32 s_reserved[190]; /* Padding to the end of the block */ 444 }; 445 446 /* 447 * Codes for operating systems 448 */ 449 #define EXT2_OS_LINUX 0 450 #define EXT2_OS_HURD 1 451 #define EXT2_OS_MASIX 2 452 #define EXT2_OS_FREEBSD 3 453 #define EXT2_OS_LITES 4 454 455 /* 456 * Revision levels 457 */ 458 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 459 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 460 461 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 462 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 463 464 #define EXT2_GOOD_OLD_INODE_SIZE 128 465 466 /* 467 * Feature set definitions 468 */ 469 470 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 471 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 472 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 473 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 474 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 475 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 476 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 477 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 478 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 479 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 480 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 481 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 482 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 483 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 484 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 485 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 486 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 487 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 488 489 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 490 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 491 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 492 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 493 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 494 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 495 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 496 497 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 498 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 499 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 500 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 501 502 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 503 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 504 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 505 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 506 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 507 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 508 509 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 510 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 511 EXT2_FEATURE_INCOMPAT_META_BG) 512 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 513 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 514 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 515 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 516 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 517 518 /* 519 * Default values for user and/or group using reserved blocks 520 */ 521 #define EXT2_DEF_RESUID 0 522 #define EXT2_DEF_RESGID 0 523 524 /* 525 * Default mount options 526 */ 527 #define EXT2_DEFM_DEBUG 0x0001 528 #define EXT2_DEFM_BSDGROUPS 0x0002 529 #define EXT2_DEFM_XATTR_USER 0x0004 530 #define EXT2_DEFM_ACL 0x0008 531 #define EXT2_DEFM_UID16 0x0010 532 /* Not used by ext2, but reserved for use by ext3 */ 533 #define EXT3_DEFM_JMODE 0x0060 534 #define EXT3_DEFM_JMODE_DATA 0x0020 535 #define EXT3_DEFM_JMODE_ORDERED 0x0040 536 #define EXT3_DEFM_JMODE_WBACK 0x0060 537 538 /* 539 * Structure of a directory entry 540 */ 541 #define EXT2_NAME_LEN 255 542 543 struct ext2_dir_entry { 544 __le32 inode; /* Inode number */ 545 __le16 rec_len; /* Directory entry length */ 546 __le16 name_len; /* Name length */ 547 char name[EXT2_NAME_LEN]; /* File name */ 548 }; 549 550 /* 551 * The new version of the directory entry. Since EXT2 structures are 552 * stored in intel byte order, and the name_len field could never be 553 * bigger than 255 chars, it's safe to reclaim the extra byte for the 554 * file_type field. 555 */ 556 struct ext2_dir_entry_2 { 557 __le32 inode; /* Inode number */ 558 __le16 rec_len; /* Directory entry length */ 559 __u8 name_len; /* Name length */ 560 __u8 file_type; 561 char name[EXT2_NAME_LEN]; /* File name */ 562 }; 563 564 /* 565 * Ext2 directory file types. Only the low 3 bits are used. The 566 * other bits are reserved for now. 567 */ 568 enum { 569 EXT2_FT_UNKNOWN = 0, 570 EXT2_FT_REG_FILE = 1, 571 EXT2_FT_DIR = 2, 572 EXT2_FT_CHRDEV = 3, 573 EXT2_FT_BLKDEV = 4, 574 EXT2_FT_FIFO = 5, 575 EXT2_FT_SOCK = 6, 576 EXT2_FT_SYMLINK = 7, 577 EXT2_FT_MAX 578 }; 579 580 /* 581 * EXT2_DIR_PAD defines the directory entries boundaries 582 * 583 * NOTE: It must be a multiple of 4 584 */ 585 #define EXT2_DIR_PAD 4 586 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 587 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 588 ~EXT2_DIR_ROUND) 589 #define EXT2_MAX_REC_LEN ((1<<16)-1) 590 591 #endif /* _LINUX_EXT2_FS_H */ 592